| plants |
pollen season |
the present status |
picture |
| Alunus |
Betulaceae |
late February ～ April |
dispersion |
  |
| Cryptmeria japonica |
Taxodiaceae |
late February ～ early April |
dispersion |
  |
| Cupressaceae |
Cupressaceae |
April ～ middle May |
dispersion |
  |
| Betula |
Butulaceae |
April ～ middle May |
dispersion |
  |
| Quercus |
Fagaceae |
late April ～ late May |
dispersion |
  |
| Juglandaceae |
Juglandaceae |
late April ～ late May |
dispersion |
  |
| Pinus |
Pinaceae |
May ～ middle June |
dispersion |
 |
| Alopecurus |
Gramineae |
latter April ～ late May |
dispersion |
  |
| Poa annua |
Gramineae |
late April ～ late May |
dispersion |
  |
| Poa pratensis |
Gramineae |
middle May ～ June |
no dispersion |
    |
| Dactylis glomerata |
Gramineae |
middle May ～ June |
no dispersion |
   |
| Lolium |
Gramineae |
middle May ～ June |
no dispersion |
  |
| Festuca |
Gramineae |
middle May ～ June |
no dispersion |
    |
| Digitaria |
Gramineae |
August ～ October |
no dispersion |
    |
| Eleusine |
Gramineae |
August ～ September |
no dispersion |
  |
| Ambrasia |
Compositae |
late August ～ September |
no dispersion |
   |
| Artemisia |
Compositae |
September ～ early October |
no dispersion |
   |
| Humulus Japonicus |
Moraceace |
September ～ early October |
no dispersion |
   |
